Mark Cuban.
Brian Snyder/Reuters
Mark Cuban, the billionaire investor and TV personality, used Twitter on Friday to weigh in on Amazon's announcement that it would acquire Whole Foods.

Cuban said one question would determine whether the purchase by the online retail giant was a smart one.

"The Amazon question," Cuban tweeted. "Can they get your groceries to you faster than you can get to the store to shop in an Uber/lyft world? Yes."

Cuban's argument, though forward-looking, is that it would take less time for Amazon to deliver your groceries from a physical Whole Foods location — by drone, van, or whatever — than for you to take an autonomous car owned by a ride-hailing company to a physical store and back.

When asked whether faster grocery delivery like he was envisioning would add value to the world, the "Shark Tank" host replied: "What is more valuable than your time?"